Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2599280c2ef6f26…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 09:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aef402884713316e5b55e861c62d0acf SHA-1: a2c7d774cd7f45d8cdd70a1dcaaa8fe9bdf6c29a SHA-256: d2599280c2ef6f261f442fe4d8846afd338bf4a3d9ba36704c8aa21228f9c61c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of a URL with a 'utm_term' parameter further indicates a campaign-like structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=real+racing+3+mod+apk+android+1 PDF link annotation
    • http://moto-bike.pl/userfiles/file/60915957564.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/9911931713.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/87971112495.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613729f9ad205---zuwisorejujopawatire.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/71811219667.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/48652157267.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/54590131933.pdfIn PDF document text
    • http://sushi-belovo.ru/files/24737755052.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f91f2f74880fe39beab248afa17aed7c/dolenunidosuror.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b09743bf5b---gazenovumew.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf8930a81---nigakirafe.pdfIn PDF document text
    • http://aven.su/userfiles/file/16464101851.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/55840750360.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210916192053.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/61976881856.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/wurukonusami.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/wemivonoz.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/75639728723.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/nikonesolosa.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/fitatulubilada.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448e0fe304e---dafapabegitirolapirole.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/nagegunikujupaze.pdfIn PDF document text
    • http://pactolous.hu/upload/file/zafunefavanosipi.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/66925746885.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136ead345146---jurajikatozupegofavo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 10952 bytes
SHA-256: b37b0e066a3011a7942113aa06ab4543652264539c515fa081738e58026b4a8a
font_01_sfnt_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 17648 bytes
SHA-256: c3d73ddc9a467b90b3b506c5741a75a23e98de310901c93f1a9d0f75c53babc7

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